I have been taking this product now for several months with noticable results in stamina and clarity of my mind. I gave it to my son who is working out and it increased his workouts, helped him stay more focus and clear thoughts in classes.

Very good quality.
wish that it came in vegi caps (it only comes in powder or gelatin caps)
I have to go through the trouble of putting it inside a vegi cap as the taste of the powder is so horrible it is not palatable.